The closed-back speaker tags are one important element required to transform the open-back A40TR headset into a closed-back noise isolating headset. For tournament play you want a microphone that will not pick up the noise of the crowd or the shout casters. This A40TR Mod Kit microphone does the trick. The majority of sound leakage in a headset occurs through the ear cushions. These synthetic leather cushions block that noise in loud environments like tournaments. Nobody wants to look like everybody else add a little splash of color or sport your favorite game's logo. Only A40TR owners can utilize Mod Kits to improve the noise isolating features of their headsets.